Audi, at the 2016 Geneva Motor Show, unveiled the SQ7 TDI. The concept features an electrically powered compressor (EPC) to spin the turbo which replaces the conventional exhaust-driven compressor and eliminates the associated lag in the process.
Audi has paced two conventional, sequential turbochargers and a third compressor that is powered electrically.
The SQ7 TDI is powered by a 4.0-liter V8 diesel that puts out 435 horsepower and an astonishing 664 lb-ft of torque. The 4.0L (3956cc) 90-degree DOHC diesel V-8 is all-new from the ground up.
The most notable feature is an electric compressor that complements the two exhaust-driven sequential turbochargers. The electric turbo kicks in from a standstill – it doesn’t require the exhaust gas spin-up of traditional turbos – and compresses air entering the SQ7’s intake; all of this translates into more power at lower engine speeds.
The new roll stabilization system relies on a compact electric motor with a three-stage planetary gearbox that separates the two halves of the stabilizer bars. It’s enabled by a new 48-volt electrical architecture in the Q7.
The compressor is driven by a 48V lithium ion battery that also powers three modules: sport differential, electromechanical active roll stabilisation and all-wheel steering.